Recent polarization transfer measurements of the ratio of elastic form factors GE/GMon the proton are not in agreement with the results of Rosenbluth-type experiments. A two photon exchange contribution to the elastic cross section is the leading theoretical candidate to explain the discrepancy. A definitive test of this theory is the direct comparison of e+p and e-p elastic scattering. A proposed measurement of this sort using a novel mixed e+e-lepton beam and the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab is described. Preliminary results from an engineering test run showing a clear signal of elastic e+p and e-p are presented.
|Number of pages||8|
|Publication status||Published - 1 Dec 2008|
|Event||conference - |
Duration: 1 Dec 2008 → …
|Period||1/12/08 → …|
Lachniet, J., Afanasev, A., Arrington, J., Brooks, W. K., Joo, K., Moteabbed, M., Niroula, M., Raue, B. A., Ungaro, M., & Weinstein, L. B. (2008). Exclusive Reactions at High Momentum Transfer - Proceedings of the International Workshop. 334-341. Paper presented at conference, . https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84885659640&origin=inward